Means for preventing offset in connection with printing.



PATENTED SEPT. 1, 1908.

J. HERGESHEIMEE. MEANS FOR PREVENTING OFFSET IN CONNECTION WITHPRINTING.

APPLICATION FILED MAY 13, 1908.

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'impulses JOHN HERGESHEIMER, or PHILADELPHIA,

PUBLISHING COMPANY, OF PHILADELPHI JERSEY.

PENNSYLVANIA, ASSIGNOR TO THE CURTIS A, PENNSYLVANIA, A CORPORATION OFNEW MEANS FOR PREVENTING OFFSET IN CONNECTION WITH PRINTIN To all whomit may concern:

Be it known that I, JOHN HERGESHEIMER, a citizen of the United States,and a resident of Philadelphia, in the county of Philadelphia and Stateof Pennsylvania, have invent;-

ed certain new and useful Means for Prevent ing Ofl set in Connectionwith Printing, of which the following is a s ecification.

The principal object o the present invention is to prevent offset, thatis what might be called blurring, smirching or smearing of the sheets asthey are delivered from a printing press in a pile. I In accordance withthe present invention the printed sheets are passed through heatradiated from a heater, which may be of the electric variety, and near asingle insulated discharger or conductor receiving a high voltageunidirectional current or a high voltage static charge of one polarity,or high voltage of the same sign or olarity; the impulses of oppositesign or polarity, or the other side of the source of unidirectionalcurrent or charge of electricity, being sent to earth or grounded withthe result that these forces cooperate in setting the ink and preventingoflset and incidentally neutralizing static electricity, if present-inthe aper.

The invention w1ll be claimed at the end hereof, but will first bedescribed in connec tion with the accompanying drawings which illustrateforms of apparatus embodyin features of the invention and chosen for thesake of explanation.

Figure 1, is a more or less diagrammatic side view illustrative oftheinvention. Fig. 2, is a perspective View illustrating mechanismembodying features of the invention, and Fig. 3, is a diagrammatic viewillustrating a modificationof the mechanism shown in 11g. 2.

In the drawings 1, are electric heaters, the construction of which isnot material, but for the sake of explanation they are shown to consistof bars 2, Wrapped with insulating material 3, as of asbestos, uponwhich are wound coils of wire 4.

5, is a reflector or shield, or both, and it may be lined with asbestos.The shield and bars are shown as supported .by means of rods 6.

7, is a conductor or discharger arranged in proximity with the heaterand to the side Specification of Letters Patent. Applicationfiled May13, 1908. Serial No. 432,574.

ries K is il ustrated.

Patented Sept. 1, 190a.

thereof toward the 'ress. The conductor 7, is properly insulate and isshown as mounted in insulating holders 8. The electric heater issuppliedwith current from any source in order to heat it.

In the'drawings I have shown an alternating current generator 9 havingconnection -by way of conductors 10, through the coils of theheater. 1The conductor 01' discharger 7, is connected with a source of hightension unidirectional current or charge or of hign tension impulses ofthe same sign or polarity. A Wimshurst staticgenerator having one polegrounded and the other connected with the conductor or discharger 7, isan example of such a source and the sign of the pole or part to whichthe conductor is connected is lmmaterial. As being in some ways a-Inoredesirable source, I have shown a transformer generator by conductors 11and of which the secondary is connected at one end to earth or groundedby a conductor 12, and at the dther end to the conductor or discharger7, through adevice or rectifier having an asymmetrical resistance andtherefore permitting of the passage of unidirectional current orimpulses of like polarity to the conductor or discharger. In Fig. 2,this device or rectifier is shown to comprise a valve tube 13 and in ofwhich the primary is connected with the Fig. 3, a s ark gap 17, of whicha multiple se- Inasmuch as the conductor 7 is arranged and connected upin substantially the manner described in British Patent No. 5948 of.1897, it follows that its effect isto remove static electricity fromthe pa er, if the same is present.

n use the described apparatus is arranged inrespect to the press and totheprinted sheets as they come from the press in the manner shown inFig. 1 that isto say, it is arranged between the press and the pile ofsheets with the discharger or conductor 7 .on the press side of theheater 1; The sheets are delivered as shown by the sheet 14 in Fig.

1, above and past the described apparatus.

In doing thisthey move in the direction shown by the arrow. The heaterradiates heat upon the sheets as they pass and in passing the sheets aresubjected to the results of the silent discharge or leakage which occursat the'conductor 7. Among the efi'ects of this silent discharge or leakmention may be made of the generation of ozone and the disturbance ofthe condition of the surrounding air. These eflects as well as others,which it is unnecessary to describe in detail in conjunction with heatradiated fromthe heater cause the ink on the sheets'to become so setthat offset is obviated.

What I claim is,

1. Means for preventing oflset'in printed sheets which comprise anelectric heater and a single insulated conductor or discharger arrangedin proximity with each other and with the moving sheets, and a source ofunidirectional high tension current or charge connected with saidconductor or discharger and with ground, substantially as described. 2.Means for preventing offset which comprise an electric heater and adischarger operatively arranged in respect to each other, and means forsupplying current to the heater and high tension unidirectional currentor charge to the discharger, whereby asilent discharge or electricalleakage is effected in proximity with the heater, substantially asdescribed;

3. Means for preventing oflset which comprise a heaterand a dischargeroperatively arranged in respect to each other, and means for supplyinghigh tension unidirectional current or charge to the discharger, wherebya silent discharge or electrical leakage is effected in roxlmity withthe heater, substantially as escribe 4. Means for preventing offset inrinting which comprise a heater and a sing e insulated conductor ordischarger arranged in proximity with each other and with the movmgsheets, and means for charging the discharger with' unidirectionalcharges orimpulses, substantially as described.

In testimony whereof I have hereunto.

signed my name.

JOHN HERGESHEIMER.

Witnesses: CLIFFORD K. CASSEL, FRANK E. FRENCH.

